Separator



T. J. STURTEVANT.

SEPARATOR.

APPLICATION FILED AUG-24. 1917.

1 ,350,626. Patented Aug. 24, 1920.

2 SHEETSSHEET l.

Invenior: M A

UNITED STATES- PATENT OFFICE.

THOMAS J. STURTEVANT, or WELLESLEY, MASSACHUSETTS, ASSIGNOR TO STURTE-MASS., A CORPORATION or MASSACHUSETTS.

VANT MILL COMPANY, OF BOSTON,

SEPARATOR.

Application filed July 24, 1917. Serial No. 182,407.

To all whom it may concern:

Be-it known that I, THOMAS J. STUKTE- VANT, a citizen of the UnitedStates, residing at lVellesley, county of Norfolk, and State ofMassachusetts, have invented an' Tm provement in Separators, of whichthe following description, in connection with the accompanying drawings,is a specification, like characters on the drawings representing likeparts.

The invention hereinafter described relates to separators for gradingmaterials, and is an improvement upon the separator shown in myapplication, Serial N 0. 173,7 84, filed June 9, 1917.

This separator comprises an inclined casing containing screens which arepercussively vibrated to facilitate the flow of the material to begraded along and through-the screens. It is desirable to have convenientaccess to the screens for the purpose of inspection, replacement andrepair thereof.

One of the objects of the invention is to provide simple and eifectivemeans for percussively vibrating'the screens, which may be liftedwiththe cover of the casing when the latter is opened. v

Another object of the; invention is to provide an improved mechanism forpercussively vibrating a screen, which will permit blows of differentforce to be imparted thereto, and thereby increase the etliciency of thescreening action.

The means for percussively vibrating the screen shown in said patent,comprises swinging hammers pivotally connected to a rotor, and adaptedto strike the end of a pin projecting down through the cover toward Inthe operation of this mechanism,'on commencement of the rotation of thehammers or on slow rotation thereof, there is a tendency for their endsto abut against the upper end of the pin andhave an end thrust againstthe same whlch may react and tend to lift the cover from the casing.

Still another object of the invention is to provide a hammer mechanismhaving means for preventing the occurrence of this.

WVith the aforesaid and other objects in view, the character of theinvention may be best understood by reference to the following'description of one good form thereof, shown in the accompanyingdrawings, wherein: V

Figure 1 is a vertical. section through the Specification of LettersPatent.

Patented Aug. 2 1-, 1920.

separator shown herein as embodying the invention, the open position ofthe cover being indicated by broken lines;

Fig. 2 is a transverse section taken on line 22 of Fig. 1;

Fig. 3 on an enlarged scale is a vertical section showing the hammermechanism and portions of the casing cover and screens;

Fig. 4 is asectional. detail of the pin for transmitting the blows fromthe hammers to the lower screen;

- Fig. 5 is a vertical 5-5 of Fig. 4;

Fig. 6 is a transverse section taken on line 6-6 of Fig. 1;

Fig. 7 is a diagram showing the sequence of hammer blows for the lowerscreen; and

F ig. 8 is a diagram showing the sequence of blows for the upper screen.

Referring to the drawings, the separator shown therein as embodying theinvention comprises an inclined casing 1 mounted on a support 3 andhaving a cover 5 connected at its upper end by hinges 7 with the casing.The lower free endof the cover is adapted to rest upon a bar 11extending transversely of the casing adjacent the lower end thereof.

One or more screens may be mounted in this casing; in the presentinstance of the invention, a lower fine screen 13 is provided resting onsprings 15 on supports 17 on the bottom of the casing. An upper coarseor scalper screen 21 is mounted in the casing above the lower screen,and is suspended from the cover by hangers 23 (Fig. 2).

The mechanism for pcrcussively vibrating the screens comprises rotors25, in the present instance of the invention, in the form of splitv hubsfast on horizontal shafts 27 journaled in bearings in brackets 31mounted on the cover. Each of these rotors has strikers or hammers 33pivotally connected thereto section taken on line adapted to be carriedaround by said rotor and impart successive blows To transmit these blowsto the screens, members or pins 35 .may be provided projecting throughrotors are disposed on their shafts at an-.

brackets 47 mounted on the cover, as shown ,in said applicatlon.

To rotate the hammer shafts, they may have sprocket wheels 19 fastthereon c011 gular intervals of advance, and the sprocket two shaftspositively maintains the latter in predetermined rotative relation.- 1 VIn the present instance of the invention, six rotors are provided, threeon each shaft, two. of which vibrate the upper screen and four of whichvibrate the lower screen' The two rotorsfor the uppe'rscreen are mountedon the upper and lower shafts 180 apart, (Fig. 8) so that their-hammersstrike blows at 90 angular intervals. The four rotors for vibrating thelower screen are disposed on their shafts at angular intervals of 90,(Fig. 7) and the eight hammers carried bysaid rotors will strike theirblows at 45 angular intervals. The rotors may be so arranged that thefirst two blows will strike the upper part of the screen, the next twoblows will strike the lower part of the screen, the next two blows willstrike the upper part of the screen, and the next two blows will strikethe lower part of the screen.

"A desirable order of sequence for. the blows for the-upper screen'isdesignated by the numbers 1 to 4. at the ends of the hammers shown in'lig. Sgand for the lower screen by the numbers 1 to 8 at theen'ds of. thehammers shown in Fig. 7.- a

The construction is such that the blows of the hammers will follow oneanother in succession and prevent occurrence of simultaneous blows onthe screen. Thus, a highly desirable distribution of blows ismaintained, and uniform vibratory effect assured.

In some cases it may be desirable to vary the foree of the alternateblows produced by the pair of hammers mounted on a rotor. To accomplishthis, one of the hammers 33 is reduced at 33 so that'it may besubstantially lighter than its companion.

Since these hammers swing freely from their pointswof pivotalCOIIDGCtlOIi' with the rotor, their variation in weight will serve toproduce blows of different force on the pin. V 7 1 p g The dispositionof the hammers for the upper screen may be such that the first two blowswillbe heavy and the second two blows will be light; and for the lowerscreen chain and wheel transmission between the venience.

through at a point aperture 59 the first four blows will be heavy andthe last four blows will be light. The reoccurrence of the heavy andlight blows will maintain the uniform vibratory effect on the screen.The heavier blows throw the material up from the screen and facilitatethe flow of the material downalong the screen; Whereas, the lighterblows facilitate the passage of the material through the screen.

It is frequently desirable to rock the coverv of the casing upward(Fig. 1) on its hinges to permit inspection, repair or replacement ofthe screens. Since the upper screen is suspended by hangers from thecover, it is lifted therewith. 7 Thisseparates the upper screen from thelower screen, and permits convenientaccessto both. I

Heretofore it has been necessary to'remove the pins for transmitting theblows from the hammers to the lower screen before lifting the cover,owing to the lateral movement of the pins against the sockets in thelower screen tending to preventupward movement of the cover. The manualoperation of through the cover and the replacement thereof is a source.of considerable incon- Next will be described means whereby these pinsmay be automatically lifted with the cover. To accomplish this, each pinmay be provided with a stop, in the present instance of the invention,in the form of a cotter pin .57 projecting transversely thereslightlyabove the collar on the cover through which the pin passes. This cotterpin is a sufficient distance from said collarto prevent interferencewith'the movement of the pin in transmitting blows from the hammer tothe screen, but when the cover is lifted, the pin will slip downwardsomewhat until the cotter pin engages the top of the collar, and then itwill be carried upward with the cover. To render this movement possible,the socket for the lower screen may be provided with a lateral whichwill, allow the side movement of the pin and prevent its interferingwith the lifting of the cover. The socket on the lower screen may bevariously formed, provided it presents an upper wall ent instanceof theinvention, in the form of lifting the several pins out screen.

pins 60, which are so located with to the hammers that they will limitward rocking of the hammers into a position where they could have theend thrust engagement, referred to, when rotation of the hammers iscommencing or is at a slow speed. During more rapid rotation of thehammers, there is not time for them to gravitate down into engagementwith their stops; However, this simple device prevents any possibilityof engagement of the hammers with the upper ends of the pins, in such amanner as to react on the hammer shafts and tend to lift the cover. I

To feed the material to be separated to the screen, the casing may beprovided with a feed box 61 at the upper end thereof containing theusual feed screw 63 for conveying the material from one end of the boxtoward the other, and causing the same to flow over an adjustable feedboard 65 and thence down onto a deflecting plate 67 for delivering thematerial into the space between the upper screen and the cover of thecasing.

, It will be understood that the invention is not limited to thespecific embodiment shown herein, but that various deviations may bemade therefrom, without departing from the spirit and scope of theappended claims.

Claims:

1. A separator comprising in combination, a casing, a cover therefor, ascreen mounted in said casing, means to percussively vibrate said screenincluding a member projecting down through said cover toward saidscreen, means automatically to lift said member from said screen onopening of said cover, and a socket on said screen receivingsaid memberand having a lateral opening allowing side movement of said member as itis lifted.

2. A separator comprising in combination, a casing, a cover therefor, alower screen mounted in said casing, an upper screen suspended from saidcover, means to percussively vibrate said screens including a memberprojecting down through said upper screen to said lower screen, andmeans automatically to lift said member from said lower screen with saidcover and upper respect down- 3. A separator comprising in combination,a casing, a cover therefor, a lower screen mounted in said casingindependently of said cover, an upper screen suspended from said cover,means to percussively vibrate said screens including members projectingfrom said cover toward said upper screen, members projecting from saidcover through said upper screen to said lower screen, and means forcausing all of said members to move upward with said cover and upperscreen when said cover is lifted to furnish access to said screens.

a. A separator comprising in combination, a casing, a cover therefor, alower screen mounted in said casing independently of said cover, anupper screen suspended from said cover, means to percussively vibratesaid screens including members projecting from said cover toward saidscreens, hammer means for striking successive blows to said members, andmeans for lifting said members with said cover and upper screen when thecover is lifted to furnish access to said screens.

5. A separator comprising in combination, a screen, and means topercussively vibrate said screen including a rotor, and

swinging hammers pivotally connected to said rotor,

one of said hammers being heavier than the other to impart blows to saidscreen of different force.

6. A separator comprising in combination, a screen, and means topercussively vibrate said screen including a rotor, swinging hammerspivotally connected to said rotor, one of said hammers being heavierthan the other to impart successive blows of different force, and meansto transmit said blows to said screen.

7. A separator comprising in combination, a screen, and means topercussively vibrate said screen including a rotor, and hammers carriedby said rotor, one of said hammers being heavier than the other toimpart successive blows to said screen of different force.

8. A separator comprising in combination, a screen, and means topercussively vibrate said screen including swing hammers havingprovisionfor alternately imparting blows to said screen of different force.

9. A separator comprising in combination, a screen, and means topercussively vibrate said screen including a pin, a rotor, swinginghammers pivotally connected to said rotor, and stop means on said rotorto limit the swinging movement of said hammers and prevent end thrust ofsaid hammers on said pin.

10. A separator comprising in combination, a screen, and means tovibrate said screen including pins, and hammer means for striking theand light blows.

11. A separator comprising in combination, a casing comprising a rotorcarrying a vibratory screen therein, and a vibrating mechanism on saidcasing, elements of different weights for imparting heavy and lightblows to said screen.

In testimony whereof, I have signed my name to this specification.

THOMAS J. STURTEVANT.

pins with alternate heavy

